SSDs invisible booting into Big Sur installer

I have two Samsung 870 EVO SSDs (port 5 and 6 on the motherboard) that are disappearing when I boot into the big sur installer. They don't show up in Disk Utility.

When I reboot into High Sierra they remain invisible. I have to literally unplug my box (though NVM reset works sometimes too) to get them back.

I see the following in the opencore logs, but I'm not certain if it's relevant:

02:629 00:028 OCJS: Got APFS super block for 5CB03DDB-7E25-D14D-864F-B5CEBEAB28DA
02:657 00:028 OCJS...

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Author: MisterPants